Leanstral 1.5Mistral AI
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About
Leanstral 1.5 is an Apache-2.0 licensed model for practical proof engineering in Lean 4, built to make formal verification more powerful and accessible. With 119B total parameters and only 6B active parameters, it delivers a major performance upgrade for theorem proving, agentic proof engineering, and real-world code verification. Leanstral 1.5 was trained through a three-stage process: mid-training, supervised fine-tuning, and reinforcement learning with CISPO. In the multiturn environment, the model receives a theorem statement, submits a proof, gets Lean compiler feedback, and refines its approach until the proof compiles or the budget is exhausted. In the code agent environment, Leanstral works like a developer in a raw filesystem: it edits files, runs bash commands, and uses the Lean language server to inspect goals, errors, and type information in real time.
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About
Empower your operators, engineers, and managers to dramatically boost the quality and productivity of your manual processes. Create digital mistake-proofing mechanisms for a variety of assembly and packing processes. Assembly Copilot tracks individual steps of an assembly process and offers audible and visual alerts to help associates avoid mistakes. Copilot also provides native support for Signal Towers and Projectors to reinforce its alerts. Assembly Copilot measures cycle times, step-level statistics, variations, and non-value-added activities. This highlights process variability and helps industrial and lean engineers balance lines. Copilot helps manufacturers extract more productivity out of their processes. Assembly Copilot extends the typical notion of Total Quality Management (TQM) beyond the traceability of parts, to every assembly step.
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Platforms Supported
Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook
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Audience
Formal methods engineers and Lean 4 researchers who need an open model for theorem proving, proof debugging, and real-world code verification
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Audience
Companies searching for an AI copilot solution for Manufacturing assembly optimization
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Support
Phone Support
24/7 Live Support
Online
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Support
Phone Support
24/7 Live Support
Online
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API
Offers API
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API
Offers API
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Pricing
Free
Free Version
Free Trial
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Pricing
No information available.
Free Version
Free Trial
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Reviews/
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Reviews/
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Training
Documentation
Webinars
Live Online
In Person
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Training
Documentation
Webinars
Live Online
In Person
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Company InformationMistral AI
Founded: 2023
France
mistral.ai/news/leanstral-1-5/
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Company InformationRetrocausal
Founded: 2019
United States
retrocausal.ai/
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Integrations
No info available.
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Integrations
No info available.
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